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[Konstantin Serebryany <1274917@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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Title:
  make sure https://bugzilla.kernel.org/show_bug.cgi?id=67651 is fixed
  in Ubunut 14.04

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The current 14.04 candidate uses the kernel version that suffers from a bug described here:
  https://bugzilla.kernel.org/show_bug.cgi?id=67651
  Please make sure to pull the kernel with the fix before the 14.04 release. 

  here is a small test case that would fail if the bug is present:

  #include <stdlib.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <sys/mman.h>
  #include <assert.h>
  int main() {
    char *p = (char*)0x600000000000;
    size_t i;
    for (i = 0; i < 100000; i++) {
      void *addr = p + i * 4096;
      void *ret = mmap(addr, 4096, PROT_WRITE | PROT_READ,
                       MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
      if (addr != ret) {
        fprintf(stderr, "failed at iteration %zd\n", i);
        char command[100];
        snprintf(command, sizeof(command), "cat /proc/%d/maps | head -30", getpid());
        system(command);
        return 1;
      }
    }
  }

  
  On a broken kernel it will print something like this:

  failed at iteration 65514
  00400000-00401000 r-xp 00000000 fc:00 20991316  /tmp/a.out
  00600000-00601000 r--p 00000000 fc:00 20991316  /tmp/a.out
  00601000-00602000 rw-p 00001000 fc:00 20991316  /tmp/a.out
  600000000000-600000001000 rw-p 00000000 00:00 0 
  600000001000-600000002000 rw-p 00000000 00:00 0 
  600000002000-600000003000 rw-p 00000000 00:00 0 
  600000003000-600000004000 rw-p 00000000 00:00 0 
  600000004000-600000005000 rw-p 00000000 00:00 0 
  ...
  --- 
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lightdm    7946 F.... pulseaudio
                        kcc        8585 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=3959574f-f6cb-4fcf-aa75-5394c06884fd
  InstallationDate: Installed on 2014-01-31 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 004: ID 0e0f:0008 VMware, Inc. 
   Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
   Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: VMware, Inc. VMware Virtual Platform
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-5-generic root=UUID=61da81e0-a5f8-45f4-96c2-6cfda9be652f ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-5-generic N/A
   linux-backports-modules-3.13.0-5-generic  N/A
   linux-firmware                            1.122
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 07/02/2012
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/02/2012:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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